238733891 has 4 divisors (see below), whose sum is σ = 260436984. Its totient is φ = 217030800.

The previous prime is 238733861. The next prime is 238733899. The reversal of 238733891 is 198337832.

238733891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 238733891 - 2¹⁰ = 238732867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (238733899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10851530 + ... + 10851551.

It is an arithmetic number, because the mean of its divisors is an integer number (65109246).

Almost surely, 2^238733891 is an apocalyptic number.

238733891 is a deficient number, since it is larger than the sum of its proper divisors (21703093).

238733891 is a wasteful number, since it uses less digits than its factorization.

238733891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21703092.

The product of its digits is 217728, while the sum is 44.

The square root of 238733891 is about 15451.0158565707. The cubic root of 238733891 is about 620.3517696813.

The spelling of 238733891 in words is "two hundred thirty-eight million, seven hundred thirty-three thousand, eight hundred ninety-one".